Photovoltaic

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Paul Gilman
PV Modules and Inverters not in Database

If you are using SAM's detailed photovoltaic model for a photovoltaic system that uses a module or inverter that is not included in SAM's libraries, you can use the CEC Performance Model with User Entered Specifications or Inverter Datasheet options on the Module and Inverter input pages, respectively. Those options allow you to enter data from a manufacturer's data sheet. Behind the scenes, SAM generates the coefficients it needs to model the equipment.

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henry_Du
What's the Installer margin and overhead

Hi, I'm a student at Duke University. I' m working on a solar PV project on campus. I have a question about Installer margin and overhead. I can't find the definition and reference about it. How can I assume it? I read your benchmark price report 2016 and 2017. Is it EPC Overhead or Developer Overhead?

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johnkern17
Battery Storage Discharge Issue

Hi:

I am modeling Solar PV with Battery Storage using a manual dispatch for the Battery Storage. I've set the manual dispatch to discharge the battery during defined time periods during Weekdays. On weekends the battery does not discharge.

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Jan Gershoj
ReOpt (Lite) functionality into SAM

Hi,

Any plans to get the functionality of ReOpt into SAM?
In other words, the possibility of directly simulating optimal PV Size based on uploaded load profile.

Thanks,

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Ludovic
How to build a dll with SDK and Visual Studio

Hello,

I am trying to understand how I can create a dll file (like ssc.dll in win32/win64 folder) with my settings or parameters to meet my needs.
I have downloaded the different folders named respectively : SAM-develop, sam-sdk-2017-9-5-r4, and ssc-develop.
I use Visual Studio 2013 for my projects.

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Tom Durston
Tom Durston's picture
SunPower X21-345 MPPT voltage limits warning

When designing PV with the SunPower X21-345-C-AC modules and microinverters with the same model name, the SAM System Design page returns a warning stating "For this combination of module and inverter, it is not possible to size the string to keep string Voc and Vmp within the MPPT voltage limits." The simulation has a significant MPPT power loss.

SunPower does not provide data on the module TCVoc or the microinverter MPPT limits, so I can't check the calculations.

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ansonccy
Negative LCOE for commercial solar PV model

I tried to model the solar PV for a several industrial sites with no upfront cost (100% debt), and I got negative LCOE for all results. Other metrics like NPV and payback years look fine. In this case, is it okay to keep the result because of the limitation of using LCOE? I just need NPV and payback actually for planning purpose. Thank you.

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Tiago M
Tiago M's picture
Export to Excel

Hi,
I performed a simulation with Parametrics but when I export to csv or excel file, the data become different as it is possible to check in attachment files. This happens because the number of decimal places are different from one to another value of irradiance in SAM results.
Can you solve my problem?

Thanks
Best regards
Tiago Marques

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Princess_Zaynab
Princess_Zaynab's picture
Methodology of calculating powers

Hello,

I am writing because I need some information about the formulas used for calculating power P_dcGross and P_ac for CPV?
I want also to have the relation between these values and the efficiency of the module?

Thanks a lot in advance,
Zaynab

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Princess_Zaynab
Princess_Zaynab's picture
Losses between DC net and monthly energy

Hello,

Please I am writing because I have a problem after making a simulation.
I plot the "DC net" and find some values.
After that I plot "monthly energy" and find values that are inferior to "DC net".

I don't understand why I have these losts, I chose the inverter that is respecting the condition "(Voc, Vsc) of the module inside the MPPT range of the inverter".

Can you help me please?

Thanks in advance,
Zaynab

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